Cone bits

The IADC (International Association of Drilling Contractors) code is the most critical factor. The first digit represents the series (1-3 for steel tooth, 4-8 for Tungsten Carbide Inserts/TCI), the second digit indicates the formation hardness (1 for soft to 4 for extra hard), and the third digit specifies the bearing/gauge protection type. Always match the bit's IADC code to the compressive strength of the rock you are drilling to avoid premature failure.

Tungsten Carbide Insert (TCI) bits are designed for hard, abrasive formations and offer higher durability, whereas Steel Tooth (Milled Tooth) bits are more cost-effective for soft formations like clay or shale. For B2B buyers, TCI bits generally offer a lower cost-per-foot in challenging environments despite a higher initial purchase price.

For high-speed or long-duration drilling, prioritize Journal Bearings (sealed) over roller bearings. Journal bearings provide a larger contact area and better load distribution. Ensure the bit features a high-quality O-ring or metal face seal to prevent drilling fluid from contaminating the bearing grease, which is the leading cause of bit locking.

Ensure the manufacturer adheres to API Spec 7-1 (American Petroleum Institute) standards for threading and dimensional accuracy. Additionally, verify ISO 9001:2015 certification for quality management. For mining or water well projects, check for material test reports (MTRs) to confirm the grade of steel used in the bit body.

Request unique serial numbers for every bit and verify them against the manufacturer's database. Conduct a pre-shipment inspection (PSI) to check for signs of 're-tipping' or repainting. On Made-in-China.com, prioritize Audited Suppliers who have undergone third-party verification of their production facilities.

Focus on Total Cost of Ownership (TCO) rather than just the unit price. Negotiate based on annual volume rather than single orders to secure 10-20% discounts. Ask for tiered pricing and clarify if the price includes export-standard wooden box packaging, which is essential for preventing thread damage during sea freight.

Cone bits are dense and heavy; ensure the supplier uses anti-rust oil coating and plastic thread protectors. For international shipping, FOB (Free On Board) is often preferred for large orders to maintain control over freight costs. Ensure the HS Code (typically 8207.19) is correctly declared to avoid customs delays or incorrect duty applications.

Use Secured Trading Services provided by platforms like Made-in-China.com to ensure payment is only released after the buyer confirms receipt and inspection. For large-scale procurement, consider a Letter of Credit (L/C) to mitigate financial risk for both parties.